Thanks for your question on Healthcare Magic. I can understand your concern. Tremors, chest tightness, unexplained diarrhoea, breathing difficulty etc are commonly seen with carcinoid syndrome. It is due to hypersecretion of histamine. So better to consult physician and get done clinical examination and blood reports like histamine levels, ultrasound abdomen, stool microscopic examination etc. You may need antihistamine drugs to control these symptoms. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.